Record core



EXAWER moss REFERENCE W. WHEELER Oct. 24, 1933.

RECORD CORE Filed Oct. 3, 1930 3 Sheets-Sheet l g \L- \\\@U avwentoz MM6 came/13 Oct. 24, 1933. w. WHEELER 1,932,057

RECORD GORE Filed Oct. 3, 1930 3 Sheets-Sheet 2 ms REFERENCE W. WHEELERmaconn com:

Filed Oct. 3, 1930 O oo coo 3; o .2

oooooo0 6 Sheets-Sheet 3 Elvwewtoz Maw Patented Oct. 24, 1933 UNITEDSTATES PATENT OFFICE This invention relates to records for phonographs,talking pictures and broadcasting, and my improvements are directed to aprocess of producing the cores of records fom fibre board, whereby saidcores will be free from any tendency to warp or become distorted.

The inexpensive and light weight characteristics of fibre board renderit desirable as a core for records, but heretofore no satisfactorytreatment for this material has been known that enables disks thereof tomaintain a permanent fiat condition, such as is necessary for recordmaking purposes.

Therefore my invention consists in treating disks of fibre board bycertain steps in a process that have the effect of destroying the lifein the fibres to render them inert, and in compacting the board.

The steps of the process comprise:

(l) Producing a disk of fibre board, as by stamping it from a sheet andproviding the central orifice therein; (2) chamfering the disk edges;(3) rotating the disk at an outward portion of its diameter betweenopposed pressure rollers to have the effect of expanding the diskdiameter radially; then reducing the thickness of the disk at itscentral portion, as by grinding away the surface material, at bothsides, within a limited radius; then subjecting the chamfered peripheralportion of the disk to treatment by a quick drying gum solution, to sealthe edge; then passing numerous high tension, electrical dischargesthrough the disk to render it foraminous and burn the tension fibres,thereby taking the life out of the material. The next step consists incoating the disk with a suitable fluid composition of vegetable originand, while the composition is moist, there is dusted or sifted thereon acoating composed of gum and zinc oxide.

Record cores thus produced may have placed thereon disks of paper (whichmay bear pictures or other surface representations, which previouslyhave been perforated by numerous high tension, electrical dischargespassed therethrough; and the cores, with their paper faces, are thensubjected to moulding pressure at suitable temperature which causes thesurfacing material on the core to penetrate the perforations in thepaper disks, and to constitute record surfaces with the moulded soundrecording lines imparted thereto by the matrix.

Other features and advantages of my invention will hereinafter appear.

In the drawings:

Figure lisaplanviewofadiskthathasbeen stamped or otherwise formed out ofa sheet of fibre board, with a central hole therein.

Fig. 2 is a central sectional view of Fig. 1.

Fig. 3 is a like section showing the peripheral edges of the disk tohave been chalnfered.

Fig. 4 shows a disk undergoing pressure between rollers.

Fig. 5 is a plan view of a disk with its edges chamfered and its centrerecessed.

Fig. 6 is a section through the centre of Fig. 5.

Fig. 7 shows a disk undergoing treatment at its chamfered edges in asealing bath.

Fig. 8 is a side elevation of an apparatus with which the disks areperforated by electrical discharges while sliding by gravity into asurfacing bath.

Fig. 9 is a plan view of Fig. 8.

The basis for my improved record core is fibre board, by which is meantWard, pasteboarg "GT-Miler board composed of fibrous ma erial.

Disks, such as indicated at 1, are cut or stamped from this material andthe usual stud or pin hole 2 for a record may be produced in the sameoperation. As another step in the process, the opposite peripheral edgesof the disk are beveled down, or chamfered, as at 3, giving theperipheral portion of the disk 2. wedge-like appearance. This is for apurpose which will be referred to hereinafter. Also the disk, in anoutward annulus over its area, indicated at 4, is subjected to pressurebetween opposed rollers, each as are shown at 5, 5 in Fig. 4. This isfor the purpose of expanding the material of the disk at the outwardannulus 4 thereof, to compensate for the -moulding pressure that issubsequently applied.

Still another step in producing the core consists in recessing the disk,at both sides, in the central, circular area 6, the recesses beingformed as by grinding out the material to a desirable depth in sucharea. By thus recessing or depressing the central area, the diskmaterial in the region thus represented is relieved from the hydraulicor other heavy moulding pressure when that is applied inthe formation ofthe record, in consequence whereof the surrounding portion of the devicewhich is to bear the music, or other sound recording lines, becomesthereby more efiiciently impressed In Figs. 7 there appears a shallowbath 7 which contains manila gum dissolved in acetone or acetic ether inpropor ions which may e approximately 1 lb. manila gum to 2 gals.acetone or acetic ether. The disk (or a number thereof) is rotated withits chamfered peripheral portion entered in this solution, forimpregnation thereby, the chamfered edges being more are at once removedtherefrom and are found to readily absorbent than the disk surfaceswould have received a surfacing of the bath composibe. The solutionbeing highly volatile, dries intion which has been described. Beforethis surstantly and seals the disk edge interstices exfacing dries thedisks have sifted thereon a powposed by the chamfering, the gum alsoaccorddered mixture of manila gum and zinc oxide, the ing a degree ofstiffness to the chamfered pezinc oxide being in pfiipoftlons of from10% to riphery. 50% of the manila gum. This powdered mix- Still anotherstep in my improved process of ture adheres to the surfacingcomposition, and making records consists in subjecting the disks thedisk, thus treated, is in readiness to have a to the influence of hightension, electrical dispaper record sheet placed thereon. charges, forthe purpose of perforating the disks This record sheet is a disk ofpaper which may with numerous tiny ,orifices, produced by the haveprinted or otherwise imposed thereon a passage of electric sparksthrough the disk mapicture or other representation. terial, burning thefibres thereof and rendering Said disk of paper may be slightly largerthan the material inert and incapable of warping or the core disk andhas been subjected to the elecdistortion. trical perforating processthat has been described For this purpose I employ the apparatus shownwith respect to the core disk, so that it also is in Figs. 8 and 9, saidapparatus comprising a meforaminous. tallic plate 8 which is supportedin an inclined Said disk of paper is placed upon the treated position asby the standards 9, 10, the standard core disk and then both disks aresubjected to 10, at the low end of plate 8 being represented hydraulicor other suitable pressure of about as extending from a vessel 11, whichis adapted tons, at a temperature of from 150 to 300 deto contain aliquid composition, constituting a gIeeS at which Pressure andtemperature t bath. The angle at which plate 8 is set may be recordlines are produced in the paper disk from sufficiently steep to enablethe disks, when placed th m rix, th h t d p r a in h thereon, to slidedown said plate by gravity, nd surfacing composition from the core diskto penethe vessel 11 is so related to the lower end of irate t p p diskthrough the perforations plate 8, that the disks will plunge into thebath therein, and to constitute the record surface. Also upon leavingthe plate. A plate 12, of insul in the mould the edge material of theslightly tion material, is placed over plate 8, in spaced larg diameterof the P p disk ds v e parallelism therewith, and is supported as by P pe edge o the d core, binding Said screws 13, whereby also the spacingbetween d and ivin a fi i h appearance t h r plates 8, 12 may beadjusted. Numerous elec- 0rd. trodes, 14, are carried by insulationplate 12, the t is o be understood that the addition of the electrodesfor example being in the form of or- P p disk D t r d c is notabsolutely dinary wood screws or machine screws that are necessary f hepr i n of a sound producing threaded through plate 12, with th ir ndoprecord, because in some instances the record core, posed to plate 8and distanced from said plate alone, and w t the Surfacing P p disk, cansufficiently to enable a high tension, static curbe Subjected t the p se und r eat i the rent electrical discharge to pass between said matrixfor the creation f h s u d pr du i electrodes and said plate 8. linesthereon.

Electrical current may be supplied from a the record core can, ifdesiredb surfaced power source as by the circuit wires 15, through withShellac its Surfacing t a the intermediary of high tension coils 16,whose Instead Of the hereinbefol'e recited liquid secondary windings reshown as including i composition of rice flour, water glass and manilaparallel respective groups of the electrodes 14. 811111 as the me fi tS- TOI' t e record The arbitrary arrangement of the electrodes Cores I yin some instances, p y 8- 0 14, indicated in Fig. 8, as carried byinsulation Position consisting o approximately equal P plate 12, showsgroups of the screws disposed in Portions of oe Q 11 a d a Solutio of asuccession of transverse areas, whereby each w with from 10% to 50% 0fmanila 8 disk, in sliding down plate 8, passes between a e manila gum.according to the proportion large number of electrodes and the plate 8,so that thereof employed, flfieets the flowing qu y of each disk intransit becomes penetrated by the composition; also hardening itssurface, and merous electrical discharges. rendering it Waterproof- Thebath in vessel 11 is. composed of approxl- This Substitute composition ys fo mately cue part of rice flour dissolved in two drying, have 8mixture Powdered m ni gum parts of water glass. a, proportion and zincdusted over its ace. Witfi'a is added 5 the bath, the ntit ereo fibreboard disk rendered foramln ous by the pene- Em g from 10% to 50% of theco bin d i e tration thereof with numerous high tension, elecflour andwater glass mixture. The consistency trical discharges, said disk beingcoated with a of the mixture is affected by the proportion of surfacingcomposition such as hasbeen described, manila gum used. and thensubjected to heat and pressure for the Congo 1 u can be used eitherinstead of the purpose of impressing the record lines thereon, ma 1 u orin conjunction therewith. Also it is found that the tiny perforationsthrough the rosin can be used as a substitute for the gums disk permitthe liberation under the pressure of provided a sufficient proportion ofrice flour be occluded gases which otherwise might cause used to renderthe product hard. blistering of the record surface to occur.

It is to be understood that I intend water glass Variations within thespirit and scope of m to equally comprehend a suitablesilica solution,invention are equally comprehended by the foreand for rice flour othersuitable v table flour going disclosure. may be substituted. Or, inplace of our, either I claim: lam black or rotten stone may beemployed. 1. The method of making record cores which u ve been a e "oaim the best results consists in producing disks from fibre board, ap-

plying moderate pressure to an annular, outward by using rice flour.

'1" e disks that have been immersed in the bath portion of the disks,recessing the central portions of said disks, and burning perforationsthroughsaid diskstolnllthefibretension.

2. The method of making record cores which consists in producing disksfrom fibre board, chamfering the edges of the disks, applying moderatepressure to an annular, outward portion of the disks, recessing thecentral portions of said disks, treating the chamfered edges with avolatile gum solution. and burning perforations through said disks tokill the fibre tension.

3. The method of making record cores which consists in producing disksfrom fibre board, applying moderate pressure to an annular, outwardportion of the disks, recessing the central portions of said disks,burning perforations through said disks to ln'll the fibre tension, andapplying a surfacing composition to said disks.

4. The method of making record cores which consists in producing disksfrom fibre board, chamfering the edges of the disks, applying moderatepressure to an annular, outward portion of the disks, recessing thecentral portions of said disks, treating the chamfered edges with avolatile gum solution, burning perforations through said disks to lnllthe fibre tension, and applying a surfacing composition to said disks.

5. The method of making records which consists in producing disks fromfibre board, killing the tension of the fibres thereof, coating thesurfaces of the disks with a composition of vegetable flour, water glassand gum, and producing the record lines under heat and pressure.

8. The method of making records which consists in producing disks fromfibre board, killing the tension of the fibres thereof, coating thesurfaces of the disks with a composition of rice flour. water glass andmanila gum, and producing the record lines under heat and pressure.

'7. The method of making records which consists in producing disks fromfibre board, killing the tension of the fibres thereof, coating thesurfaces of the disks with a composition of vegetable fiour, water glassand gum, dusting the composition while moist with powdered gum and zincoxide, placing sheets of foraminous paper on the surfaced disks, andproducing the record lines under heat and pressure.

8. The method of making records which consists in producing disks fromfibre board, killing the tension of the-fibres thereof, coating thesurfaces of the disks with a composition of vegetable water glass andgum, dusting the composition while moist with powdered gum andvzincoxide, placing-sheets of foraminous paper, which may bear pictorialrepresentations, on the surfaced disks, and producing the record linesunder heat and pressure.

9. A record core comprising a disk of fibre board that is provided withnumerous burnt i n perforations.

10. A record core comprising a disk of fibre board whose edges arechamfered and sealed with gum, said disk having centrally disposedrecesses at its sides, and having a compacted outward annular portion.

11. A record core comprising a disk of fibre board that is provided withnumerous burnt-in perforations, said disk bearing a surfacingcomposition of vegetable flour, water glass and manila gum.

12. A record comprising a disk of fibre board that is provided withnumerous burnt-in perforations, said disk bearing a surfacingcomposition of vegetable fiour, water glass and manila gum, and recordlines impressed therein.

13. A record comprising a disk of fibre board that is provided withnumerous burnt-in perfo rations, said disk bearing a surfacingcomposition of vegetable fiour, water glass and manila gum, a foramiouspaper disk on said composition, and record lines impressed upon thecomposition extruded through said paper disk.

14. A record comprising a disk of fibre board that is provided withnumerous burnt-in perforations, said disk bearing a surfacingcomposition of vegetable flour, water glass and manila gum, a foraminouspaper disk, bearing a pictorial representation, on said composition, andrecord lines impressed upon the composition extruded through said paperdisk.

15. A record surfacing composition consisting of rice flour water glassand manila gum.

- 16. The method of making records which consists in producing disksfrom fibre board, passing numerous high-tension electrical dischargesthrough the disks to kill the tension of the fibres, coating thesurfaces of the disks with a composition of vegetable flour, water glassand gum, and producing the record lines under heat and pres- WILLIAM :l-m :4-

